Rear vibration and noise
I have a 2004 Dodge Ram 1500 quad cab long bed with about 36,000 miles. Recently I have noticed a vibration during acceleration. From what I can tell it feels like the rear end is "hopping" I also have a squeak coming from the rear differential (I believe where the driveshaft comes into the diff) It is not constant and changes as it rotates (Like it squeals during half the rotation and not the other half) it also appears to go away at higher speeds.
To top everything off I looked under there tonight and it appears the seal on the front side of the differential is starting to leak as I have fluid spray on my gas tank and exhaust piping. I checked and I still have fluid in the diff and it appears to just have started leaking.
Does anyone have any ideas what the first problems could be and/or have trouble shooting ideas? I have put the truck on jack stands and the noise is still there and is defiantly coming from the diff area. I assume the only fix for the leak is a new seal. How hard is this to replace? Do I have to drop the entire rear end or can this be replaced on the vehicle?
Thank you everyone in advance